Tubular boiler.



No. 876,378. PATENTED JAN. 14. 1908. W. MULLER.

TUBULAR BOILER.

APPLIOATION FILED MAR. so, 1906.

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MULLER. TUBULAR BOILER.

APPLICATION FILED MAR. 30, 1906.

PATENTED JAN. 14. 1908.

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\VILHELM MULLER, OF HAMBURG, GERMANY.

TUBULAR BOILER.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed Ma ch 30. 1906- Serial No. 308.885.

To all whom it may concern:

Be it known that I, W'ILHELM MoLLEn, a citizen of the German Empire, anda resident of Hamburg, Germany, have invented certain new and usefulImprovements in Tubular Boilers, of which the following is aspecification.

This invention relates to the arrangement of having the upper waterchamber or head above the water level of the boiler and the injection ofthe feed water into the lower water chamber. The steam 'forn'iing in theupper water chamber when starting to heat the boiler is of highertension than at other parts and will naturally expand and enter throughthe upper connecting pipes into the boiler by bubbling from thedownwardly directed open ends of upright pipes entering the boiler. Theupper chamber completely fills with hot water and a lively circulationis kept up by the constantly rising hot water from the highly heatedtubular system.

In order to apply the invention with ad Vantage more particularly toships boiler,

it is advisable to provide For the easy removal of the water tubes aswell as for their instalment in the smallest possible space. For thispurpose the vertical water pipes between the two water chambers arecurved as portions of a circle. Though curved pipes have been previouslyused to afford easy removal there is a novel feature in the presentarrangement inasmuch as they can be readily and expeditiously removed bydisconnecting each one of the covers separately 01 the water chamber,while in existing systems they can only be removed by opening the waterchamber and then pulling the pipes into the interior and then out ofsaid chamber. Obviously the opening and closing of a cover of the waterchamber is simpler and less injurious to the boiler than having to openthe boiler itself. Ordinary bent water tubes have been mounted at anincline so as to economize space in the height of the structure but myimproved system or arrangement insures even greater economy in thisdirection.

In order that the invention may be clearly understood and readilycarried into eil'ect, I will now proceed to describe the same withreference to the accompanying drawings, in which:

Figure 1 is a top view partly shown in section. Fig. 2 is a rear viewwith parts removed. Fig. 3 is a side elevation shown partly in section,of the improved arrangement.

The flame-tube boiler is marked a, its furnace tubes are marked 1), theiirebars c, the firebridge (Z and the [lame tubes 0. To the rear of theboiler a are secured an upper chamber-f and a lower chamber 9 connectedby a system oi" curved water tubes 7b as shown. The lower chamber 9communicates with the lower part oi the boiler through pipes i, T-pipe/r and longitudinal pipe Z which reaches to about the middle of theboiler. The upper chamber f is fitted with pipes m which lead to T-pipesa, and pipes 0, that enter the boiler and open below the water level WV.I Externally above the furnace tubes 1) is 'lixed a (leilector bridge (1ol iire bricks serving to direct the flames towards the water pipes 72'.Another bridge 7* ol" lire bricks is built between the rear plate ol"the boiler and the upper water chamber].

The generation oi steam is more energetically carried out in the pipesit than in the boiler a and therefore the steam and water has a tendencyto flow into the latter. The -leed water entering by supply pipes 19 p,into lower chamber 9 is obliged to pass through the pipes h where it isheated and flows with the other water and steam into the boiler a. Thewater thus withdrawn from the water pipe system through the discharge)ipes m, a, 0 is constantly replenished from t 1e water at the lowerpart of the boiler through the pipes i and this energeticcirculationgreatly expedites the heating of the boiler water.

In Fig. 3 one of the water pipes is shown drawn out as indicated by dashand dot lines. The curved pipes It can be withdrawn without himlrance oithe deck S which is not possible with the straight pipes.

The walls surrounding the sides and back of the water tubes are coveredwith asbestos or fire clay.

What I claim is:

A boiler having an upper perforated water feed Water pipe entering thelower chamber,

substantially as specified. Y 10 Signedby me at Hamburg this 17th day ofMarch 1906.

chamber above the water level, covers closing said chamber, pipesconnecting said chamber with the boiler below the Water level, a lowerperforated water chamber bel low the upper water chamber, covers closingWILHELM MGLLER. said lower chamber, curved pipes connecting Witnesses:the upper and lower chambers and removable AUGUST WENK,

through the chamber-perforations, and al IDA CHRIST HAFERMANN

